Wonder how much Ben Affleck spent on coffee on March 19 in Los Angeles. / SMXRF/Star Max FilmMagic

by Ann Oldenburg, USA TODAY

by Ann Oldenburg, USA TODAY

Ben Affleck, Josh Groban, Sophia Bush and Debi Mazar are among the celebs who have committed to take the 2013 Live Below the Line challenge issue by The Global Poverty Project. They will live on $1.50 of food and drink a day (no Starbucks for him!) April 29-May 3 to raise awareness about extreme poverty.

Live Below the Line aims to help people better empathize with the 1.4 billion people who face extreme poverty, and hopes to encourage fundraising to support partner organizations.

The $1.50 figure is the current equivalent of the accepted global figure used to define extreme poverty.

The stars hope to encourage others to support the cause and do the same.

Josh Groban had such an eye-opening experience participating in last year's Live Below the Line campaign, that he not only signed up to do it again this year, but he has also included a song, Below the Line, on his new album. "It's amazing how much we take for granted not having to live in hunger," he notes in the announcement.